Auto mechanic Cade Yager (Walhberg) is trying to support himself and his teenage daughter Tessa (Nicola Peltz) by repairing a lot of undriveable wrecks. He is desperately unsuccessful, but only until one of the shattered trucks turns out to be a Transformer, and the most important one – Optimus Prime. Cade can hardly be happy about this, because America has not yet fully recovered from the battle between the "good" Autobots and the "evil" Decepticons, which destroyed half of Chicago at the end of the third part. Four years later, all representatives of this alien race are on the index and elite scientific minds are trying to create Earthly Transformers that would more effectively face similar threats. But we know from the past that the road to hell is paved with good intentions, and this case will be no different. However, Cade is not too bothered by this. For now. As the new human partner of the most famous Transformer, he finds himself not only on the radar of the American government, but also being pursued by Optimus' compatriots. His daughter has fallen in love with all of this, which as a father he certainly cannot agree with. The fourth Transformers, in addition to Wahlberg in the lead role, will bring another major novelty - Dinobots, which are mechanical creatures that look like prehistoric lizards. Welcome to the transformed Jurassic Park.